Satellite Navigation Receiver System and Reference Station Network Server

(19)

(11)

EP 1 340 996 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.02.2005 Bulletin 2005/05

(43)	Date of publication A2:
	03.09.2003 Bulletin 2003/36

(21)	Application number: 02028100.2

(22)	Date of filing: 17.12.2002

(51)	International Patent Classification (IPC)⁷: G01S 5/14, H04J 3/06

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR
	Designated Extension States:
	AL LT LV MK RO

(30)

Priority:

19.02.2002 US 79250

(71)	Applicants:
	eRide, Inc. San Francisco, California 94118-1837 (US) SEIKO EPSON CORPORATION Shinjuku-ku, Tokyo 163-0811 (JP)

(72)	Inventors:
	Kimura, Akira San Francisco, California 94109 (US) McBurney, Paul W. San Francisco, California 94118 (US)

(74)	Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
	Maximilianstrasse 58 80538 München 80538 München (DE)

(54)	Satellite Navigation Receiver System and Reference Station Network Server

(57) A navigation-satellite receiver uses a reference station accessible over a network to store NAV data subframes for pattern matching at a network client. Alternatively, the pattern matching is performed by the server when per-byte communication costs are high. The stored NAV data repeats ephemeris data every thirty seconds, and full almanac data every 12.5 minutes. This permits the client to instantly recognize where in the NAV data sequence its own received signals are, and it need not actually wait to receive the preambles in the TLM words. Several precious seconds are therefore saved in producing a rapid time-to-first-fix.

Search report